MOPED ARMY

what kind of top speed are you getting out of it?

the exhaust might have a removable baffle under the end cap that might help. carb and intake restriction are going to be bottle necks, but if it was mine, I wouldn't go nuts with the mods.

absolutely make sure your ignition timing is spot on, if it is late, might seem ok on the flat, but you will die on the hills and starts.

and check your compression. using a high quality oil at the right mix can help ring sealing / compression / power, along with lubrication. the thing is 60 years old.

I have a '64 and it slows enough on big hills (like probably any stock single speed) to need to pedal it.

Hey guys, thanks for the response. The Gurtner is 9mm/11mm is measured at intake side and air box side of Venturi. The top speed with the original sprocket was about 28-30 speedometer indicated and I lost 3-4 with gearing change. The exhaust has a plate near the rear with a tube running through it that has 6 1/8 holes in it to allow the exhaust to empty into a smaller space with the exhaust

tip in it. I have not done anything to the air box or filter screens. I can take pictures for the curious. I am unfamiliar with circuit pipe. I’ll Google. Thanks again.

Hah. Thanks Pat Splat

Thanks Kevin, I don’t want to do any internal modifications at this time. It is running well except climbing hills. I’ll do some exhaust and carburation mods first.